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Walczak J, Camargo Johnson MD, Muthumalaiappan K. Stage Specific Expression Pattern of Alpha-Hemoglobin-Stabilizing-Protein ( AHSP) Portrayed in Erythroblast Chronology. Methods Protoc 2020; 3:E46. [PMID: 32629835 DOI: 10.3390/mps3030046] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2020] [Revised: 06/26/2020] [Accepted: 06/26/2020] [Indexed: 12/17/2022] Open
Abstract
During erythropoiesis, the molecular chaperone alpha-hemoglobin-stabilizing protein (AHSP) sequesters free alpha-hemoglobin (αHb) and prevents precipitation of excess αHb. While AHSP is linked to hereditary anemia, the pattern of expression during specific erythroblast stages is poorly understood. We investigated gene and protein expressions of AHSP throughout progressive maturation stages of erythroblasts in biphasic cultures of blood and bone marrow samples from healthy donors. Differentiating erythroblasts were periodically subjected to flow cytometry, Amnis imaging and RT-qPCR analyses. We made parallel in vivo validations from naive murine bone marrow cells. Percentages of AHSP+ erythroblasts, protein expressions and AHSP gene expressions are negligible on culture day 6 (CFU-Es) and progressively increases from culture days 8-12 (peaks on day 12) and declines on day 14. Notably, sub-cellular location of AHSP is both in the cytoplasm and nucleus in the early erythroblasts while in the late stages of maturation AHSP is found predominantly in the nucleus, being expelled with it during enucleation. As both human bone marrow and peripheral blood mononuclear cells (PBMC) derived erythroblasts demonstrated similar expression patterns, sampling of erythroblasts from day 11 cultures could portray erythroblast chronology and provide optimum representative stage specific expression patterns. PBMCs may be suitable for comparison studies of AHSP expression in pathologic erythropoiesi.
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Che Yaacob NS, Islam MA, Alsaleh H, Ibrahim IK, Hassan R. Alpha-hemoglobin-stabilizing protein ( AHSP): a modulatory factor in β-thalassemia. Int J Hematol 2020; 111:352-359. [PMID: 31894534 DOI: 10.1007/s12185-019-02806-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2019] [Revised: 12/11/2019] [Accepted: 12/12/2019] [Indexed: 11/30/2022]
Abstract
Hemoglobin (Hb) is an iron-containing metalloprotein that transports oxygen molecules from the lungs to the rest of the human body. Among the different variants of Hb, HbA1 is the most common and is composed of two alpha (αHb) and two beta globin chains (βHb) constructing a heterotetrameric protein complex (α2β2). Due to the higher number of AHSP genes, there is a tendency to produce approximately twice as much of α subunit as β subunit. Therefore, there is a chance of presenting excess α subunit leftover in human blood plasma; excess subunits subsequently bind with each other and aggregates β-thalassemia occurs due to lack of or reduced numbers of βHb subunit. Alpha-hemoglobin-stabilizing protein (AHSP) is a scavenger protein which acts as a molecular chaperon by reversibly binding with free αHb forming a complex (AHSP-αHb) that prevents aggregation and precipitation preventing deleterious effects towards developing serious human diseases including β-thalassemia. Clinical severity worsens if mutations in AHSP gene co-occur in patients with β-thalassemia. Considering the mechanism of action of AHSP and its contribution to ameliorating β-thalassemia severity, it could potentially be used as a modulatory agent in the treatment of β-thalassemia.
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Affiliation(s)
- Nur Suraya Che Yaacob
- Department of Haematology, School of Medical Sciences, Universiti Sains Malaysia, 16150, Kubang Kerian, Kelantan, Malaysia
| | - Md Asiful Islam
- Department of Haematology, School of Medical Sciences, Universiti Sains Malaysia, 16150, Kubang Kerian, Kelantan, Malaysia
| | - Heba Alsaleh
- Department of Haematology, School of Medical Sciences, Universiti Sains Malaysia, 16150, Kubang Kerian, Kelantan, Malaysia
| | - Ibrahim Khidir Ibrahim
- Department of Haematology, School of Medical Sciences, Universiti Sains Malaysia, 16150, Kubang Kerian, Kelantan, Malaysia.,Department of Haematology, Faculty of Medical Laboratory Sciences, Al-Neelain University, Khartoum, Sudan
| | - Rosline Hassan
- Department of Haematology, School of Medical Sciences, Universiti Sains Malaysia, 16150, Kubang Kerian, Kelantan, Malaysia.
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Scheps KG, Hasenahuer MA, Parisi G, Targovnik HM, Fornasari MS. Curating the gnomAD database: Report of novel variants in the globin-coding genes and bioinformatics analysis. Hum Mutat 2019; 41:81-102. [PMID: 31553106 DOI: 10.1002/humu.23925] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2019] [Revised: 09/14/2019] [Accepted: 09/23/2019] [Indexed: 02/02/2023]
Abstract
Massive parallel sequencing technologies are facilitating the faster identification of sequence variants with the consequent capability of untangling the molecular bases of many human genetic syndromes. However, it is not always easy to understand the impact of novel variants, especially for missense changes, which can lead to a spectrum of phenotypes. This study presents a custom-designed multistep methodology to evaluate the impact of novel variants aggregated in the genome aggregation database for the HBB, HBA2, and HBA1 genes, by testing and improving its performance with a dataset of previously described alterations affecting those same genes. This approach scored high sensitivity and specificity values and showed an overall better performance than sequence-derived predictors, highlighting the importance of protein conformation and interaction specific analyses in curating variant databases. This study also describes the strengths and limitations of these structural studies and allows identifying residues in the globin chains more prone to tolerate substitutions.
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Affiliation(s)
- Karen G Scheps
- Departamento de Microbiología, Inmunología, Biotecnología y Genética, Cátedra de Genética, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Buenos Aires, Argentina.,Instituto de Inmunología, Genética y Metabolismo (INIGEM), Universidad de Buenos Aires - CONICET, Buenos Aires, Argentina
| | - Marcia A Hasenahuer
- Departamento de Ciencia y Tecnología, Universidad Nacional de Quilmes, Bernal, Argentina.,European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Trust Genome Campus, Hinxton, United Kingdom.,Department of Medical Genetics, Cambridge Institute for Medical Research, University of Cambridge, Cambridge, United Kingdom
| | - Gustavo Parisi
- Departamento de Ciencia y Tecnología, Universidad Nacional de Quilmes, Bernal, Argentina
| | - Héctor M Targovnik
- Departamento de Microbiología, Inmunología, Biotecnología y Genética, Cátedra de Genética, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Buenos Aires, Argentina.,Instituto de Inmunología, Genética y Metabolismo (INIGEM), Universidad de Buenos Aires - CONICET, Buenos Aires, Argentina
| | - María S Fornasari
- Departamento de Ciencia y Tecnología, Universidad Nacional de Quilmes, Bernal, Argentina
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Zhu GZ, Yang YL, Zhang YJ, Liu W, Li MP, Zeng WJ, Zhao XL, Chen XP. High Expression of AHSP, EPB42, GYPC and HEMGN Predicts Favorable Prognosis in FLT3-ITD-Negative Acute Myeloid Leukemia. Cell Physiol Biochem 2017; 42:1973-1984. [PMID: 28793301 DOI: 10.1159/000479837] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2017] [Accepted: 03/28/2017] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND/AIMS Acute myeloid leukemia (AML) is a heterogeneous clonal disease and patients with AML who harbor an FMS-like tyrosine kinase 3 (FLT3) mutation present several dilemmas for the clinician. This study aims to identify novel targets for explaining the dilemmas. METHODS We analyzed four microarray gene expression profiles to investigate changes in whole genome expression associated with FLT3-ITD mutation. RESULTS We identified 22 differentially expressed genes which are commonly expressed among all four profiles. Kaplan-Meier analysis of the dataset GSE12417 revealed that low expression of AHSP, EPB42, GYPC and HEMGN predicted poor prognosis (AHSP: P=0.0317, HR=1.894; EPB42: P=0.0382, HR=1.859; GYPC: P=0.0015, HR=2.051; HEMGN: P=0.0418, HR=1.838 in GSE12417 test cohort; AHSP: P=0.0279, HR=1.548; EPB42: P=0.0398, HR=1.505; GYPC: P=0.0408, HR=1.501; HEMGN: P=0.0143, HR=1.630 in GSE12417 validation cohort). When patients were FLT3-ITD positive, the expression of FLT3 was significantly increased (all P<0.05 in four profiles), and correleation analysis of four profiles revealed that the expression of the four candidate genes negatively correlated with FLT3 expression. CONCLUSIONS Our findings suggest that AHSP, EPB42, GYPC and HEMGN may be suitable biomarkers for diagnostic or therapeutic strategies for FLT3-ITD-positive AML patients.
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Affiliation(s)
- Gang-Zhi Zhu
- Department of Clinical Pharmacology, Xiangya Hospital, Central South University, Changsha, China.,Haikou People's Hospital and Affiliated Haikou Hospital of Xiangya Medical School, Central South University, Haikou, China
| | - Yong-Long Yang
- Haikou People's Hospital and Affiliated Haikou Hospital of Xiangya Medical School, Central South University, Haikou, China
| | - Yan-Jiao Zhang
- Department of Clinical Pharmacology, Xiangya Hospital, Central South University, Changsha, China
| | - Wei Liu
- Department of Hematology, Xiangya Hospital, Central South University, Changsha, China
| | - Mu-Peng Li
- Department of Clinical Pharmacology, Xiangya Hospital, Central South University, Changsha, China
| | - Wen-Jing Zeng
- Department of Clinical Pharmacology, Xiangya Hospital, Central South University, Changsha, China
| | - Xie-Lan Zhao
- Department of Hematology, Xiangya Hospital, Central South University, Changsha, China
| | - Xiao-Ping Chen
- Department of Clinical Pharmacology, Xiangya Hospital, Central South University, Changsha, China
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Somekawa S, Mine T, Ono K, Hayashi N, Obuchi S, Yoshida H, Kawai H, Fujiwara Y, Hirano H, Kojima M, Ihara K, Kim H. Relationship between Sensory Perception and Frailty in a Community-Dwelling Elderly Population. J Nutr Health Aging 2017; 21:710-714. [PMID: 28537337 DOI: 10.1007/s12603-016-0836-5] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
BACKGROUND Aging anorexia, defined as loss of appetite and/or reduced food intake, has been postulated as a risk factor for frailty. Impairments of taste and smell perception in elderly people can lead to reduced enjoyment of food and contribute to the anorexia of aging. OBJECTIVE To evaluate the relationship between frailty and taste and smell perception in elderly people living in urban areas. DESIGN Data from the baseline evaluation of 768 residents aged ≥ 65 years who enrolled in a comprehensive geriatric health examination survey was analyzed. Fourteen out of 29-items of Appetite, Hunger, Sensory Perception questionnaire (AHSP), frailty, age, sex, BMI, chronic conditions and IADL were evaluated. AHSP was analyzed as the total score of 8 taste items (T) and 6 smell items (S). Frailty was diagnosed using a modified Fried's frailty criteria. RESULTS The area under the receiver operator curves for detection of frailty demonstrated that T (0.715) had moderate accuracy, but S (0.657) had low accuracy. The cutoffs, sensitivity, specificity and Youden Index (YI) values for each perception were T: Cutoff 26.5 (YI: 0.350, sensitivity: 0.639, specificity: 0.711) and S: Cutoff 18.5 (YI: 0.246, sensitivity: 0.690, specificity: 0.556). Results from multiple logistic regression models, after adjusting for age, sex, IADL and chronic conditions showed that participants under the T cutoff were associated with exhaustion and those below the S cutoff were associated with slow walking speed. The adjusted logistic models for age, sex, IADL and chronic conditions showed significant association between T and frailty (OR 2.81, 95% CI 1.29-6.12), but not between S and frailty (OR 1.73, 95% CI 0.83-3.63). CONCLUSIONS Taste and smell perception, particularly taste perception, were associated with a greater risk of frailty in community-dwelling elderly people. These results suggest that lower taste and smell perception may be an indicator of frailty in old age.
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Affiliation(s)
- S Somekawa
- Hunkyung Kim, Research Team for Promoting Independence of the Elderly, Tokyo Metropolitan Institute of Gerontology, 35-2 Sakaecho, Itabashi-ku, Tokyo 173-0015, Japan, Tel: +81-3-3964-3241(ext.4212), Fax: +81-3-39642316,
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Sagar CS, Kumar R, Sharma DC, Kishor P. Alpha hemoglobin stabilizing protein: Its causal relationship with the severity of beta thalassemia. Blood Cells Mol Dis 2015; 55:104-7. [PMID: 26142324 DOI: 10.1016/j.bcmd.2015.05.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2014] [Revised: 05/11/2015] [Accepted: 05/11/2015] [Indexed: 02/07/2023]
Abstract
Thalassemia major is characterized by anemia, iron overload and cellular damage. The severity of symptoms correlates with the alpha/non-alpha globin imbalance and is proportional to the magnitude of alpha chain excess. Alpha hemoglobin stabilizing protein (AHSP), the erythroid specific alpha globin chaperone, stabilizes free alpha chains, and prevents the formation of reactive oxygen radicals. Though AHSP expression has been linked to the severity of beta thalassemia, its role as a probable genetic modifier of disease severity, has still not been unequivocally established. In the present study, the level of the chaperone has been seen to vary in regularly transfused beta thalassemia patients, being underexpressed in 64% of cases, upregulated in 16% and comparable to controls in 20% of the cases. This discrepancy may be attributed to the degree of DNA damage, % HbF, and the number of nucleated RBCs in the peripheral blood of these patients. Results reveal that a decrease in the free alpha chain pool, and hence the repertoire of unbound iron, due to elevated HbF and/or the presence of nucleated RBCs in the peripheral blood results in the upregulation of the AHSP gene.
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Abstract
Thalassemia is known as a diverse single gene disorder, which is prevalent worldwide. The molecular chaperones are set of proteins that help in two important processes while protein synthesis and degradation include folding or unfolding and assembly or disassembly, thereby helping in cell homeostasis. This review recaps current knowledge regarding the role of molecular chaperones in thalassemia, with a focus on beta thalassemia.
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Affiliation(s)
- Afshan Sumera
- Department of Pathology, School of Medicine, International Medical University, Kuala Lumpur, Malaysia.
| | - Ammu Radhakrishnan
- Department of Pathology, School of Medicine, International Medical University, Kuala Lumpur, Malaysia
| | - Abdul Aziz Baba
- Department of Pathology, School of Medicine, International Medical University, Kuala Lumpur, Malaysia
| | - Elizabeth George
- Department of Pathology, University Putra Malaysia, Kuala Lumpur, Malaysia
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Ranjbaran R, Okhovat MA, Mobarhanfard A, Aboualizadeh F, Abbasi M, Moezzi L, Golafshan HA, Behzad-Behbahani A, Bagheri M, Sharifzadeh S. Relationship between AHSP gene expression, β/α globin mRNA ratio, and clinical severity of the β-thalassemia patients. Ann Clin Lab Sci 2014; 44:189-193. [PMID: 24795058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
BACKGROUND Alpha hemoglobin stabilizing protein (AHSP) is a chaperone-like molecule specialized for erythroid series which binds to free α-globin chain. According to this characteristic, AHSP can be considered an important factor which reduces beta thalassemia symptoms. MATERIALS AND METHODS Reticulocytes RNA extraction and a subsequent cDNA synthesis were performed, followed by Relative qRT-PCR for AHSP, alpha, and beta globin chain genes. The beta actin gene was used as an endogenous reference as well. The relationship between AHSP gene expression, disease severity, and the β/α globin mRNA ratio was studied among different homozygote β-thalassemia patients (mild, moderate and severe) and compared with minor thalassemia and the normal population. RESULTS Analysis of the β-globin/α-globin mRNA ratio has shown that disease severity enhanced with a decrease in this proportion. Evaluation of the correlation between AHSP gene expression and the average of the β-globin/α-globin expression ratio indicated a significant but indirect relationship in considered groups. Our results demonstrated that the AHSP gene expression increases in accordance with augmentation of clinical symptoms. CONCLUSIONS Although one of the main reasons for reduced clinical severity in homozygote β-thalassemia can be the high level of AHSP gene expression as a chaperon molecule, our findings indicated that AHSP gene expression decreased in a mild category as compared to that in severe and moderate groups.
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Affiliation(s)
- Reza Ranjbaran
- PhD.; Deputy Paramedical Education, School of Paramedical Sciences, Shiraz University of Medical Sciences, Shiraz, Iran; phone:+987112270240;
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